Engine/Transmission (1998.5 - 2002) Jacobs E-Brake & PacBrake Shifter Switch

[Silver_Ram]

I have the Jacobs Exhaust brake on my truck. I bought the PacBrake shifter switch & want to install it, but the wiring for the two brakes is a little different. I read through some previous posts, but didn't fing anything applicable with what I am doing.



The Jacobs brake uses 4 wires from the switch & the PacBrake uses 3 wires. I have figured out what to do with the ECM & ground wires. I think the switched on (ignition hot) wire is for the switch light on either switch.



I get lost with the solenoid wire. The Jacobs runs a separate from the switch, & on the PacBrake in appears to be tied to the ECM wire before it gets to the switch.



My initial plans were to run the PacBrake switch only, & save the Jacobs switch for when the PacBrake switch breaks. I changed out the Jacobs wiring quick disconnect & have a spare disconnect that I can use with the PacBrake switch. Can I install a jumper wire from the ECM wire to the solenoid wire on the switch side of the disconnect?



OR



How would I wire the PacBrake switch as an inline on say the solenoid wire & still use the Jacobs switch as the master?



Please Help, I'm tired of reaching down low to the jacobs switch.



Troy

 

[Supermod56]

I have the knob mounted switch from Geno's, all I did was tie into one of the wires(can't remember which one) in the Jake switch going back to the solenoid. I leave the Jake switch on all the time, tucked under the dash, the knob breaks the connection back to the solenoid. If you find a wire on the Pac Brake switch that turns on/off with the button, that should work.



Tom

 

[jstyer]

On mine I just cut the hot wire to the master switch and tied the pacbrake switch in between to break and make a circuit. I leave the master switch on all the time. Been working great for 3 years.

 

[SRadke]

In the 03's Pacbrake activates their unit by grounding an ECM port, not sure how they control on the older ones. Mine is wired similar to Jstyer's, it works.



-Scott

 

[Sixpack]

On mine I just cut the hot wire to the master switch and tied the pacbrake switch in between to break and make a circuit. I leave the master switch on all the time. Been working great for 3 years.

Ditto here! The wire that is cut is the yellow wire. Then attach the shifter switch to each end of the cut yellow wires.